JPH08235554A - Magnetic head device - Google Patents

Abstract

PURPOSE: To make possible recording of a high-transfer rate signal by a magnetic field modulation recording system. CONSTITUTION: A slider 6 corresponding to the recording surface (d) of a magneto-optical disk D in a disk mounting position is formed of aluminum. The heat generated in a magnetic coil by current supply to the magnetic coil is consequently released via a head core 9 to the slider 6 outside the magnetic head 8 at the time of recording on the magneto-optical disk D and, therefore, the head core 9 does not attain a high temp. and the magnetic characteristics of the head core 9 are maintained. The occurrence of the degradation in recording efficiency is thus prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head device suitable for use in a magnetic field modulation overwrite type magneto-optical disk device for recording / reproducing information signals on / from a magneto-optical disk.

[0002]

2. Description of the Related Art In recent years, as a means for storing data in a computer or the like, a magneto-optical disk has been used because it has advantages such as a large data storage capacity, high speed access and excellent portability. A recording / reproducing device which is a recording medium has been used.

Up to the present, as a recording / reproducing apparatus of this type, a recording / reproducing apparatus of two kinds, that is, an optical modulation recording method or a magnetic field modulation recording method has been put into practical use.

In the recording / reproducing apparatus of the magnetic field modulation recording system, the magnetic field direction of the magnetic recording material is changed by inverting the magnetic field direction of the magnetic coil according to the information signal when the magnetic recording material is heated by laser light. Since information is recorded by the method, there are features such as overwriting is possible and the disk structure is simple.

By the way, in this type of recording / reproducing apparatus, a current having a frequency proportional to the frequency of the information signal is supplied to the magnetic coil.

In this case, if the impedance of the magnetic coil is high, the frequency characteristic of the magnetic coil is deteriorated. Therefore, it is necessary to reduce the number of turns of the magnetic coil to reduce the impedance.

However, in such a recording / reproducing apparatus, when a relatively large current is supplied to the magnetic coil in order to obtain a sufficient magnetic flux for recording, the temperature of the magnetic coil rises due to heat generation of the magnetic coil and the recording efficiency decreases. There's a problem.

For this reason, a recording / reproducing apparatus has been studied, which enables recording even if the auxiliary magnetic field generated in the magnetic coil is small by bringing the magnetic coil as close as possible to the magneto-optical disk at the disk mounting position.

This is because if recording is possible even if the magnetic field generated in the magnetic coil is small, the current supplied to the magnetic coil can be small, so that heat generation of the magnetic coil is suppressed to prevent a decrease in recording efficiency. This is because it is considered to be gained.

Conventionally, this type of recording / reproducing apparatus has a slider which is elastically held at the tip of the load beam and corresponds to the recording surface of the magneto-optical disk at the disk mounting position, and a head core and a magnetic coil attached to this slider. A magnetic head device having a flying type magnetic head is used.

In the magnetic head device of such a recording / reproducing apparatus, the slider is levitated from the magneto-optical disk by about 10 μm in response to the air flow generated by the rotation of the magneto-optical disk.

[0012]

However, in the conventional magnetic head device, since it is necessary to suppress the abrasion due to the contact of the slider with the magneto-optical disk, a ceramic material such as potassium titanate having a high abrasion resistance is used for the slider. Therefore, the thermal conductivity of the slider is relatively poor (the thermal conductivity of the ceramic material is 0.2 to 0.3).
It is about J / cm · s · K. ), The heat generated by the magnetic coil due to the current supply was accumulated in the head core.

As a result, when the temperature of the head core rises and becomes high, the recording efficiency is deteriorated due to the deterioration of the magnetic characteristics of the head core, and a high transfer rate signal such as a video signal cannot be recorded by the magnetic field modulation recording method. there were.

When the temperature of the head core exceeds the Curie point, no magnetic flux is generated and recording may be impossible.

The present invention has been made in view of the above circumstances, and it is possible to maintain the magnetic characteristics of the head core and prevent a decrease in recording efficiency. Therefore, a high transfer rate signal is recorded by the magnetic field modulation recording method. The present invention provides a magnetic head device that can be used.

[0016]

In the magnetic head device according to the present invention, the slider corresponding to the recording surface of the disk at the disk mounting position is formed of a good heat conductive material.

[0017]

In the present invention, the heat generated by the magnetic coil due to the current supply to the magnetic coil is radiated to the slider outside the magnetic head through the head core.

[0018]

Embodiments of the present invention will be described in detail below with reference to embodiments shown in the drawings.

FIG. 1 is a perspective view showing a magnetic head device according to the present invention.

In FIG. 1, the reference numeral 1 designates a head carriage that moves forward and backward in the radial direction of the magneto-optical disk D at the disk mounting position, and is attached to a movable body (not shown) of a linear motor (not shown). There is.

Reference numeral 2 denotes a sheet metal load beam in which a magnetic head described later is elastically held at one end of the beam, and a base 3 is adhered to the other end of the beam to be cantilevered and supported by the head carriage 1. The plate spring is formed in a substantially trapezoidal shape in a plan view and has a widthwise dimension that decreases from the beam supporting end toward the beam free end.

On some side edges of the load beam 2, rising pieces 4 and 5 for beam reinforcement, which project to the side opposite to the disk mounting position, are integrally formed by bending.

Reference numeral 6 denotes a slider corresponding to the recording surface d of the magneto-optical disk D at the disk mounting position, which is elastically held at the beam free end of the load beam 2 via a flexure 7 having a substantially U-shaped cross section. The optical disc D at the disc mounting position can be levitated by the air flow generated by the rotation.

The entire slider 6 is, for example, 2.2J
The disk contact surface 6a is formed of a good heat conductive material such as aluminum having a heat conductivity of / cm · s · K, and the disk contact surface 6a is, for example, a tough ram treatment which is a composite treatment of aluminum and tetrafluoroethylene resin. Wear-resistant surface treatment such as.

A flying type magnetic head 8 having a head core 9 and a magnetic coil (not shown) is incorporated in the slider 6 and is configured to generate a magnetic field.

The head core 9 of the magnetic head 8 is glass-melted at one end of the slider 6 and at the end of the load beam 2 on the supporting side, and the entire head core 9 is open toward the disk mounting position. It is formed of a substantially U-shaped ferrite material.

On the other hand, in the magnetic coil (not shown) of the magnetic head 8, the coil intermediate portion is wound around the end portion of the head core 9 on the side opposite to the core mounting side, and the end portion of each coil lead wire side is formed by soldering. It is connected to a terminal (not shown) on the slider 6.

Reference numeral 10 is a mounting screw for fixing the base 3 and the load beam 2 to the head carriage 1.

In the magnetic head device thus constructed, since the slider 6 is made of aluminum, a magnetic coil (not shown) is supplied by supplying a current to the magnetic coil (not shown) at the time of recording on the magneto-optical disk D. The heat generated in the magnetic head 8 passes through the head core 9
It is released to the outer slider 6.

Therefore, in the present embodiment, since the head core 9 does not reach a high temperature as in the conventional case, the magnetic characteristics of the head core 9 can be maintained and the recording efficiency can be prevented from lowering.

Further, in this embodiment, the disk contact surface 6a of the slider 6 is subjected to the tough ram treatment, so that the slider 6 has abrasion resistance.

In this embodiment, the slider 6
However, the present invention is not limited to this, and any other material having a good thermal conductivity capable of effectively releasing the heat generated from the magnetic head 8 to the slider 6 can be used. Material may be used.

Further, in the present embodiment, the slider 6
Although the example in which the disk contact surface 6a is subjected to the tough lam treatment is shown, the present invention may be subjected to the surface treatment such as hard alumite treatment and hard chrome plating treatment.

Besides, in the present embodiment, an example in which the present invention is applied to a magneto-optical disk device has been shown, but the present invention is not limited to this, and can be applied to a magnetic disk device as in the embodiment.

[0035]

As described above, according to the present invention, since the slider corresponding to the recording surface of the disc at the disc mounting position is made of a material having good thermal conductivity, current is supplied to the magnetic coil during recording on the disc. The heat generated by the magnetic coil is radiated to the slider outside the magnetic head via the head core.

Therefore, since the head core does not reach a high temperature as in the conventional case, the magnetic characteristics of the head core can be maintained, a decrease in recording efficiency can be prevented from occurring, and a high transfer rate signal can be recorded by the magnetic field modulation recording method. .

According to the second aspect, the abrasion-resistant surface treatment is applied to the disk contact surface of the slider, which means that the slider has abrasion resistance, so that abrasion occurs due to contact of the slider with the disk at the disk mounting position. Can be prevented.

[Brief description of drawings]

FIG. 1 is a perspective view showing a magnetic head device according to the present invention.

[Explanation of symbols]

 6 ... Slider 6a ... Disk contact surface 8 ... Magnetic head 9 ... Head core D ... Magneto-optical disk d ... Recording surface

Claims (2)

[Claims] 1. A magnetic head device comprising: a slider that moves forward and backward in the disk radial direction corresponding to the recording surface of the disk at a disk mounting position; and a magnetic head device that is attached to the slider and has a head core and a magnetic coil. A magnetic head device characterized by being formed of a material having good thermal conductivity. 2. The magnetic head device according to claim 1, wherein the disk contact surface of the slider is subjected to abrasion resistant surface treatment.